Pulverizing-mill.



B. A. ONEILL. PULVBRIZING MILL.

APPLICATION FILED PBB.23, 1912.

Patented Dec. 16, 1913.

2 SHEETS-SHEET 1.

` B. A. ONEILL.

PULVBRIZING MILL.

APPLICATION FILED P21123. 1912.

BENJAMIN A. NEILL, 0F MINNEAPOLIS, MINNESOTA.

PULVERIZING-MILL.

Specification of Letters Patent.

Patented Deo. 16,1913.

Application led February 23, 1912. SeralNo. 679,257.

To all whom z't may concern:

Be it known that I, BENJAMIN A. ONnrLL, a citizen ofthe United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Pulverizing-Mills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the artI to which it appertains to make and use the same.

My invention has for its object to improve pulverizing or grindino' mills of the character disclosed and broadly claimed in the U. S. Letters Patent No. 619,354, issued of date February 14th, 1899, `to J. M. Schultz, and in Letters Patent No. 745,075, `issued to the same party, of date, November 24th, 1903. The millsshown ,in the prior patents above identified employ a casing having an approximately cylindrical inici'- nally corrugated liningwith which `cooperates a multiplicity of rotary beaters arranged to rotate under high Velocity. The material to be pulverized is fed through the casing and the pulverization is produced partly by the impacts produced by the beaters and partly by the impacts preduced by the material thrust by the beaters against the internally corrugated surface of the case lining. Much of the material to be pulverized will, by the beaters, be thrown against an adjacent side of the casing, and in the prior patents, the said side of the casing has been made smooth.

The important feature of the present invention consists in rovidin the casing with the corrugated side, pre erably in the form of a hardened corrugated ring, located adjacent to but extending radially inward from one edge of the corrugated approximately cylindrical case lining. By the use of this corrugated side late or ring, the pulverizing capacity or e ciency of the machine is very greatly increased. This fact I have demonstrated in practice.

In the accompanying drawings which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings, Figure 1 is a side elevation of the `machine with some parts removed and with some parts shown in section; Fig. 2 is a vertical section taken through the machine approximately on the line m? m2 on Fig. 1; and Fig. 3 is a perspective view showing in detail, a section of the corrugated annular side members.

It may be here stated that the machine illustrated in the drawings, except for the novel feature noted, is substantially like that illustrated in said prior Patent 745,075, and hence, may be briefly described.

The numeral 1 indicates the casing and the numeral 2 the base of the machine, the former having a combined feed and air intake trunk 3 that opensaxially in the said casing through one side thereof. Secured to the other side of the casing 1 is a so-called The numeral 10 indicates a rotary valve located in a conduit 11 that connects the top lof the casing to the trunk 3.

The projecting shaft 19. of the rotary valve 10 is provided with a beveled gear 13 that mesheswith a beveled pinion 14 secured on a shaft 15, mounted in suitable bearings on the upper portion of the casing 1. The shaft 15 carries a pulley 16. The said shaft 15 is driven from the beater shaft 7 through a belt 17 that runs over said shaft 7 and over said pulley 16.

The numeral 18 indicates an internally corrugated or otherwise roughened linin which closely surrounds the beaters 8 and is suitably secured within the casing 1.

The numeral 19 indicates an annular grinding plate, preferably made up of segments, set into the adjacent flat side wall of the casing 1 and detachablv secured thereto by screws 20 or other suitable mean This annular grinding plate 19 extends circumferentially and radially inward of one edge of the approximately cylindrical lining or grinding members 18, and its inner face is provided with sharp corrugations or similar sharp protuberance against which the material to be pulverized will be dashed by the beaters 8. Obviously, the detachable segmental sections which make up the so-called f@ p noeaeeo grindingring 19 are reversible, so that either of the sides thereof may be exposed to the stock. This is important because, While certain kinds ofstock require the additional pulverizing or grindingaction produced by the additional rouo'hened surfaces, there are, nevertheless, certain kinds of stock, to Wit, relatively soft stock, which doe's not require this additional pulverizing action.

When the machine is in action, to pulverize the material being passed therethrough, such material Will be violently dashed about Within the casing and by the myrads of blows struck by the beaters, and the impacts produced by dashing the same against the grinding surface of the members 18 and 19, lwill be reduced to a finely pulverized condition, and when properly reduced Will be forced or blown outward through the passage 6 between the coned and the disk 5. Also, the rotary valve l0 Will be rotated at such a speed as required to take up the insufliciently ground materials and return the same to the delivery trunk 3. The addition of the auxiliary grinding plate in the Wall of the casing adjacent to one edge of the approximately cylindrical grinding plate or lining, has been found to increase the eciency of the machine about twenty-tive per cent. i

`What ll claim iszl. In a pulverizer or grinding mill, the combination With a casing having an inlet for the stock at one side and an outlet therefor at the other side, of an internally corrugated or roughened imperforate approximately cylindrical lining, an annular grinding ring detachably applied Within said casing on that side thereof through which the stock is delivered into said casing, said ring having substantially parallel opposite faces, one of which is smooth and the other roughened, and a rotary beater 'Working in said casing and coperating With the roughened surfaces of said lining and grinding 2. In a pulverizer or grinding mill, the combination With a casing having an inlet for the stock at one side and an outlet therefor at the other sidefof an internally corrugated or roughened imperforate approximately cylindrical lining, said casing pro- 1c,

vided With a recess on that side thereof y through which the stock is delivered into said casing, and an annular ring positioned in said recess, said ring having a roughened surface substantially flush Wit-h the Wall of p the casing in which the ring is positioned.

3. ln a pulverizer or grinding mill, the combination With a casing having an inlet for the stock at one side and an outlet therefor at the other side, of an internally corrugated or roughened imperforate approximately cylindrical lining, and an annular grinding ring applied Within the said casing, and a rotary beater Working in said casing and coperating With the roughened surfaces of said lining andV grinding ring, the said grinding ring being roughened on one side and smooth on the other, and re- 7 i versible to expose either the rough or smooth side thereof to the stock, the rough and smooth sides of said ring being each formed so as to be seated against said casing Wall.

ln testimony whereof I alix my signature 7 y,

in presence of tWo Witnesses.

BENJAMllN A. ONEILL. Witnesses:

, F. D. MERCHANT,

HARRY D. KILGORE. 

